“五·六”大火对大兴安岭北坡的生态环境与植物群落产生了一系列影响.主要表现在过火的山杨、白桦林大部死亡,重火烧的樟子松、落叶松严重受损,但落叶松抗火性强,翌年多数大径级林木复苏.阳向斜、陡坡火烧后,呈现中度面蚀,薄土地段碎石裸露,植被恢复很慢,造成山下河流雨季洪峰提早到来.阴坡与阳坡平缓坡上植被恢复快,植物种类无大变化,无水土流失现象.宽谷地带火烧后,植物种类变化很小,沼泽化未加重.坡度大的阳坡,干旱加剧,群落为更耐旱的种类所取代.重度火烧迹地,白桦、山杨萌生条大量发生,生长旺盛,今已形成大面积杨桦次生林;植被盖度小的阳坡,有樟子松母树的地段,产生大量幼苗;落叶松缺少结实,迹地不见更新.如不加强人为措施,该林区优势群落—落叶松林将为杨桦林取代. The “5.6” fire produced a series of impacts on the ecological environment and plant communities on the northern slope of the Greater Hinggan Mountains, mainly in over-poplar trees, most of the birch forests died, severely burned Pinus sylvestris var. , But larch fire resistance is strong, the following year most of the large-diameter forest recovery Yang positive slope, steep slope after burning, showing moderate surface erosion, thin gravel bare soil, vegetation recovery is very slow, resulting in early arrival of mountain river rainy peak early .The vegetation on the gentle slopes of the shady slopes and sunny slopes recovered rapidly with no significant changes of plant species and no water and soil loss.When the broad valleys were burned, the plant species changed little and the swamping did not aggravate.The slope with a large slope increased the drought, For the more drought-resistant species replaced by heavy burned areas, white birch, mountain poplar spawn occurred in large numbers, vigorous growth, has formed a large area of ​​secondary birch birch forest; vegetation cover a small sunny slope, the Pinus sylvestris mother tree lot, Resulting in a large number of seedlings; lack of strong larch, no trace of renewal without strengthening human measures, the dominant community in the forest - larch forest will be replaced by birch.